1806212528917 has 2 divisors, whose sum is σ = 1806212528918. Its totient is φ = 1806212528916.

The previous prime is 1806212528801. The next prime is 1806212528941. The reversal of 1806212528917 is 7198252126081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1423365916401 + 382846612516 = 1193049^2 + 618746^2 .

It is an emirp because it is prime and its reverse (7198252126081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1806212528917 - 2¹⁵ = 1806212496149 is a prime.

It is a super-2 number, since 2×1806212528917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1806212528977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903106264458 + 903106264459.

It is an arithmetic number, because the mean of its divisors is an integer number (903106264459).

Almost surely, 2^{1806212528917} is an apocalyptic number.

It is an amenable number.

1806212528917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806212528917 is an equidigital number, since it uses as much as digits as its factorization.

1806212528917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 1806212528917 in words is "one trillion, eight hundred six billion, two hundred twelve million, five hundred twenty-eight thousand, nine hundred seventeen".